Gustavo Larsen PublicationsCopyright (c) 2014 University of Nebraska - Lincoln All rights reserved.http://digitalcommons.unl.edu/cbmelarsen
Recent documents in Gustavo Larsen Publicationsen-usThu, 03 Jul 2014 18:23:54 PDT3600Facile sol-gel synthesis of porous silicas using poly(propylene)imine dendrimers as templateshttp://digitalcommons.unl.edu/cbmelarsen/1
http://digitalcommons.unl.edu/cbmelarsen/1Thu, 22 Oct 2009 08:08:53 PDT
Commercially available poly(propylene)imine (DAB-Am-32 and DAB-Am-64) dendrimers were used as single-molecule templates to tailor the porosity of silicas via a nonacidic sol-gel method. X-ray diffraction on both the as-prepared (oven-dried at 373 K) and the calcined (833 K) materials revealed that modest contraction took place on template removal and that the cavities created did not achieve three-dimensional ordering under the current synthesis conditions. Transmission electron microscopy of “Pt-stained” samples supported this picture. A modified Horvath–Kawazoe analysis of the argon adsorption isotherms indicated that DAB-Am-64 is a much more effective template than DAB-Am-32. Pyrolysis and oxidation protocols for template removal are also presented.
]]>
Gustavo Larsen et al.